pv/views/trace/view.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifdef ENABLE_DECODE
  21 #include <libsigrokdecode/libsigrokdecode.h>
  22 #endif
  23
  24 #include <extdef.h>
  25
  26 #include <algorithm>
  27 #include <cassert>
  28 #include <climits>
  29 #include <cmath>
  30 #include <iostream>
  31 #include <iterator>
  32 #include <unordered_set>
  33
  34 #include <boost/archive/text_iarchive.hpp>
  35 #include <boost/archive/text_oarchive.hpp>
  36 #include <boost/serialization/serialization.hpp>
  37
  38 #include <QApplication>
  39 #include <QEvent>
  40 #include <QFontMetrics>
  41 #include <QMouseEvent>
  42 #include <QScrollBar>
  43 #include <QVBoxLayout>
  44
  45 #include <libsigrokcxx/libsigrokcxx.hpp>
  46
  47 #include "analogsignal.hpp"
  48 #include "header.hpp"
  49 #include "logicsignal.hpp"
  50 #include "ruler.hpp"
  51 #include "signal.hpp"
  52 #include "tracegroup.hpp"
  53 #include "triggermarker.hpp"
  54 #include "view.hpp"
  55 #include "viewport.hpp"
  56
  57 #include "pv/data/logic.hpp"
  58 #include "pv/data/logicsegment.hpp"
  59 #include "pv/devices/device.hpp"
  60 #include "pv/globalsettings.hpp"
  61 #include "pv/session.hpp"
  62 #include "pv/util.hpp"
  63
  64 #ifdef ENABLE_DECODE
  65 #include "decodetrace.hpp"
  66 #endif
  67
  68 using pv::data::SignalData;
  69 using pv::data::Segment;
  70 using pv::util::TimeUnit;
  71 using pv::util::Timestamp;
  72
  73 using std::back_inserter;
  74 using std::copy_if;
  75 using std::count_if;
  76 using std::inserter;
  77 using std::max;
  78 using std::make_pair;
  79 using std::make_shared;
  80 using std::min;
  81 using std::pair;
  82 using std::placeholders::_1;
  83 using std::set;
  84 using std::set_difference;
  85 using std::shared_ptr;
  86 using std::stringstream;
  87 using std::unordered_map;
  88 using std::unordered_set;
  89 using std::vector;
  90
  91 namespace pv {
  92 namespace views {
  93 namespace trace {
  94
  95 const Timestamp View::MaxScale("1e9");
  96 const Timestamp View::MinScale("1e-12");
  97
  98 const int View::MaxScrollValue = INT_MAX / 2;
  99
 100 const int View::ScaleUnits[3] = {1, 2, 5};
 101
 102
 103 CustomScrollArea::CustomScrollArea(QWidget *parent) :
 104         QAbstractScrollArea(parent)
 105 {
 106 }
 107
 108 bool CustomScrollArea::viewportEvent(QEvent *event)
 109 {
 110         switch (event->type()) {
 111         case QEvent::Paint:
 112         case QEvent::MouseButtonPress:
 113         case QEvent::MouseButtonRelease:
 114         case QEvent::MouseButtonDblClick:
 115         case QEvent::MouseMove:
 116         case QEvent::Wheel:
 117         case QEvent::TouchBegin:
 118         case QEvent::TouchUpdate:
 119         case QEvent::TouchEnd:
 120                 return false;
 121         default:
 122                 return QAbstractScrollArea::viewportEvent(event);
 123         }
 124 }
 125
 126 View::View(Session &session, bool is_main_view, QWidget *parent) :
 127         ViewBase(session, is_main_view, parent),
 128         splitter_(new QSplitter()),
 129         segment_display_mode_(Trace::ShowLastSegmentOnly),
 130         segment_selectable_(false),
 131         scale_(1e-3),
 132         offset_(0),
 133         ruler_offset_(0),
 134         updating_scroll_(false),
 135         settings_restored_(false),
 136         header_was_shrunk_(false),
 137         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 138         always_zoom_to_fit_(false),
 139         tick_period_(0),
 140         tick_prefix_(pv::util::SIPrefix::yocto),
 141         tick_precision_(0),
 142         time_unit_(util::TimeUnit::Time),
 143         show_cursors_(false),
 144         cursors_(new CursorPair(*this)),
 145         next_flag_text_('A'),
 146         trigger_markers_(),
 147         hover_point_(-1, -1),
 148         scroll_needs_defaults_(true),
 149         saved_v_offset_(0),
 150         scale_at_acq_start_(0),
 151         offset_at_acq_start_(0),
 152         suppress_zoom_to_fit_after_acq_(false)
 153 {
 154         QVBoxLayout *root_layout = new QVBoxLayout(this);
 155         root_layout->setContentsMargins(0, 0, 0, 0);
 156         root_layout->addWidget(splitter_);
 157
 158         viewport_ = new Viewport(*this);
 159         scrollarea_ = new CustomScrollArea(splitter_);
 160         scrollarea_->setViewport(viewport_);
 161         scrollarea_->setFrameShape(QFrame::NoFrame);
 162
 163         ruler_ = new Ruler(*this);
 164
 165         header_ = new Header(*this);
 166         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 167
 168         // We put the header into a simple layout so that we can add the top margin,
 169         // allowing us to make it line up with the bottom of the ruler
 170         QWidget *header_container = new QWidget();
 171         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 172         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 173         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 174         header_layout->addWidget(header_);
 175
 176         // To let the ruler and scrollarea be on the same split pane, we need a layout
 177         QWidget *trace_container = new QWidget();
 178         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 179         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 180         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 181         trace_layout->setContentsMargins(0, 0, 0, 0);
 182         trace_layout->addWidget(ruler_);
 183         trace_layout->addWidget(scrollarea_);
 184
 185         splitter_->addWidget(header_container);
 186         splitter_->addWidget(trace_container);
 187         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 188         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 189         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 190         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 191         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 192         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 193
 194         viewport_->installEventFilter(this);
 195         ruler_->installEventFilter(this);
 196         header_->installEventFilter(this);
 197
 198         // Set up settings and event handlers
 199         GlobalSettings settings;
 200         coloured_bg_ = settings.value(GlobalSettings::Key_View_ColouredBG).toBool();
 201
 202         GlobalSettings::add_change_handler(this);
 203
 204         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 205                 this, SLOT(h_scroll_value_changed(int)));
 206         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 207                 this, SLOT(v_scroll_value_changed()));
 208
 209         connect(header_, SIGNAL(selection_changed()),
 210                 ruler_, SLOT(clear_selection()));
 211         connect(ruler_, SIGNAL(selection_changed()),
 212                 header_, SLOT(clear_selection()));
 213
 214         connect(header_, SIGNAL(selection_changed()),
 215                 this, SIGNAL(selection_changed()));
 216         connect(ruler_, SIGNAL(selection_changed()),
 217                 this, SIGNAL(selection_changed()));
 218
 219         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 220                 this, SLOT(on_splitter_moved()));
 221
 222         connect(&lazy_event_handler_, SIGNAL(timeout()),
 223                 this, SLOT(process_sticky_events()));
 224         lazy_event_handler_.setSingleShot(true);
 225
 226         // Trigger the initial event manually. The default device has signals
 227         // which were created before this object came into being
 228         signals_changed();
 229
 230         // make sure the transparent widgets are on the top
 231         ruler_->raise();
 232         header_->raise();
 233
 234         // Update the zoom state
 235         calculate_tick_spacing();
 236
 237         // Make sure the standard bar's segment selector is in sync
 238         set_segment_display_mode(segment_display_mode_);
 239 }
 240
 241 View::~View()
 242 {
 243         GlobalSettings::remove_change_handler(this);
 244 }
 245
 246 Session& View::session()
 247 {
 248         return session_;
 249 }
 250
 251 const Session& View::session() const
 252 {
 253         return session_;
 254 }
 255
 256 unordered_set< shared_ptr<Signal> > View::signals() const
 257 {
 258         return signals_;
 259 }
 260
 261 void View::clear_signals()
 262 {
 263         ViewBase::clear_signalbases();
 264         signals_.clear();
 265 }
 266
 267 void View::add_signal(const shared_ptr<Signal> signal)
 268 {
 269         ViewBase::add_signalbase(signal->base());
 270         signals_.insert(signal);
 271
 272         signal->set_segment_display_mode(segment_display_mode_);
 273         signal->set_current_segment(current_segment_);
 274
 275         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 276                 this, SLOT(on_signal_name_changed()));
 277 }
 278
 279 #ifdef ENABLE_DECODE
 280 void View::clear_decode_signals()
 281 {
 282         decode_traces_.clear();
 283 }
 284
 285 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 286 {
 287         shared_ptr<DecodeTrace> d(
 288                 new DecodeTrace(session_, signal, decode_traces_.size()));
 289         decode_traces_.push_back(d);
 290
 291         d->set_segment_display_mode(segment_display_mode_);
 292         d->set_current_segment(current_segment_);
 293
 294         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 295                 this, SLOT(on_signal_name_changed()));
 296 }
 297
 298 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 299 {
 300         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 301                 if ((*i)->base() == signal) {
 302                         decode_traces_.erase(i);
 303                         signals_changed();
 304                         return;
 305                 }
 306 }
 307 #endif
 308
 309 View* View::view()
 310 {
 311         return this;
 312 }
 313
 314 const View* View::view() const
 315 {
 316         return this;
 317 }
 318
 319 Viewport* View::viewport()
 320 {
 321         return viewport_;
 322 }
 323
 324 const Viewport* View::viewport() const
 325 {
 326         return viewport_;
 327 }
 328
 329 void View::save_settings(QSettings &settings) const
 330 {
 331         settings.setValue("scale", scale_);
 332         settings.setValue("v_offset",
 333                 scrollarea_->verticalScrollBar()->sliderPosition());
 334
 335         settings.setValue("splitter_state", splitter_->saveState());
 336         settings.setValue("segment_display_mode", segment_display_mode_);
 337
 338         {
 339                 stringstream ss;
 340                 boost::archive::text_oarchive oa(ss);
 341                 oa << boost::serialization::make_nvp("ruler_shift", ruler_shift_);
 342                 settings.setValue("ruler_shift", QString::fromStdString(ss.str()));
 343         }
 344         {
 345                 stringstream ss;
 346                 boost::archive::text_oarchive oa(ss);
 347                 oa << boost::serialization::make_nvp("offset", offset_);
 348                 settings.setValue("offset", QString::fromStdString(ss.str()));
 349         }
 350
 351         for (shared_ptr<Signal> signal : signals_) {
 352                 settings.beginGroup(signal->base()->internal_name());
 353                 signal->save_settings(settings);
 354                 settings.endGroup();
 355         }
 356 }
 357
 358 void View::restore_settings(QSettings &settings)
 359 {
 360         // Note: It is assumed that this function is only called once,
 361         // immediately after restoring a previous session.
 362
 363         if (settings.contains("scale"))
 364                 set_scale(settings.value("scale").toDouble());
 365
 366         if (settings.contains("ruler_shift")) {
 367                 util::Timestamp shift;
 368                 stringstream ss;
 369                 ss << settings.value("ruler_shift").toString().toStdString();
 370
 371                 boost::archive::text_iarchive ia(ss);
 372                 ia >> boost::serialization::make_nvp("ruler_shift", shift);
 373
 374                 ruler_shift_ = shift;
 375         }
 376
 377         if (settings.contains("offset")) {
 378                 util::Timestamp offset;
 379                 stringstream ss;
 380                 ss << settings.value("offset").toString().toStdString();
 381
 382                 boost::archive::text_iarchive ia(ss);
 383                 ia >> boost::serialization::make_nvp("offset", offset);
 384
 385                 // This also updates ruler_offset_
 386                 set_offset(offset);
 387         }
 388
 389         if (settings.contains("splitter_state"))
 390                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 391
 392         if (settings.contains("segment_display_mode"))
 393                 set_segment_display_mode(
 394                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 395
 396         for (shared_ptr<Signal> signal : signals_) {
 397                 settings.beginGroup(signal->base()->internal_name());
 398                 signal->restore_settings(settings);
 399                 settings.endGroup();
 400         }
 401
 402         if (settings.contains("v_offset")) {
 403                 saved_v_offset_ = settings.value("v_offset").toInt();
 404                 set_v_offset(saved_v_offset_);
 405                 scroll_needs_defaults_ = false;
 406                 // Note: see eventFilter() for additional information
 407         }
 408
 409         settings_restored_ = true;
 410         suppress_zoom_to_fit_after_acq_ = true;
 411
 412         // Update the ruler so that it uses the new scale
 413         calculate_tick_spacing();
 414 }
 415
 416 vector< shared_ptr<TimeItem> > View::time_items() const
 417 {
 418         const vector<shared_ptr<Flag>> f(flags());
 419         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 420         items.push_back(cursors_);
 421         items.push_back(cursors_->first());
 422         items.push_back(cursors_->second());
 423
 424         for (auto trigger_marker : trigger_markers_)
 425                 items.push_back(trigger_marker);
 426
 427         return items;
 428 }
 429
 430 double View::scale() const
 431 {
 432         return scale_;
 433 }
 434
 435 void View::set_scale(double scale)
 436 {
 437         if (scale_ != scale) {
 438                 scale_ = scale;
 439                 scale_changed();
 440         }
 441 }
 442
 443 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 444 {
 445         if ((offset_ != offset) || force_update) {
 446                 offset_ = offset;
 447                 ruler_offset_ = offset_ + ruler_shift_;
 448                 offset_changed();
 449         }
 450 }
 451
 452 const Timestamp& View::offset() const
 453 {
 454         return offset_;
 455 }
 456
 457 const Timestamp& View::ruler_offset() const
 458 {
 459         return ruler_offset_;
 460 }
 461
 462 void View::set_zero_position(pv::util::Timestamp& position)
 463 {
 464         ruler_shift_ = -position;
 465
 466         // Force an immediate update of the offsets
 467         set_offset(offset_, true);
 468         ruler_->update();
 469 }
 470
 471 void View::reset_zero_position()
 472 {
 473         ruler_shift_ = 0;
 474
 475         // Force an immediate update of the offsets
 476         set_offset(offset_, true);
 477         ruler_->update();
 478 }
 479
 480 int View::owner_visual_v_offset() const
 481 {
 482         return -scrollarea_->verticalScrollBar()->sliderPosition();
 483 }
 484
 485 void View::set_v_offset(int offset)
 486 {
 487         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 488         header_->update();
 489         viewport_->update();
 490 }
 491
 492 unsigned int View::depth() const
 493 {
 494         return 0;
 495 }
 496
 497 uint32_t View::current_segment() const
 498 {
 499         return current_segment_;
 500 }
 501
 502 pv::util::SIPrefix View::tick_prefix() const
 503 {
 504         return tick_prefix_;
 505 }
 506
 507 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 508 {
 509         if (tick_prefix_ != tick_prefix) {
 510                 tick_prefix_ = tick_prefix;
 511                 tick_prefix_changed();
 512         }
 513 }
 514
 515 unsigned int View::tick_precision() const
 516 {
 517         return tick_precision_;
 518 }
 519
 520 void View::set_tick_precision(unsigned tick_precision)
 521 {
 522         if (tick_precision_ != tick_precision) {
 523                 tick_precision_ = tick_precision;
 524                 tick_precision_changed();
 525         }
 526 }
 527
 528 const pv::util::Timestamp& View::tick_period() const
 529 {
 530         return tick_period_;
 531 }
 532
 533 unsigned int View::minor_tick_count() const
 534 {
 535         return minor_tick_count_;
 536 }
 537
 538 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 539 {
 540         if (tick_period_ != tick_period) {
 541                 tick_period_ = tick_period;
 542                 tick_period_changed();
 543         }
 544 }
 545
 546 TimeUnit View::time_unit() const
 547 {
 548         return time_unit_;
 549 }
 550
 551 void View::set_time_unit(pv::util::TimeUnit time_unit)
 552 {
 553         if (time_unit_ != time_unit) {
 554                 time_unit_ = time_unit;
 555                 time_unit_changed();
 556         }
 557 }
 558
 559 void View::set_current_segment(uint32_t segment_id)
 560 {
 561         current_segment_ = segment_id;
 562
 563         for (shared_ptr<Signal> signal : signals_)
 564                 signal->set_current_segment(current_segment_);
 565 #ifdef ENABLE_DECODE
 566         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 567                 dt->set_current_segment(current_segment_);
 568 #endif
 569
 570         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 571
 572         trigger_markers_.clear();
 573         for (util::Timestamp timestamp : triggers)
 574                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 575
 576         // When enabled, the first trigger for this segment is used as the zero position
 577         GlobalSettings settings;
 578         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 579
 580         if (trigger_is_zero_time && (triggers.size() > 0))
 581                 set_zero_position(triggers.front());
 582
 583         viewport_->update();
 584
 585         segment_changed(segment_id);
 586 }
 587
 588 bool View::segment_is_selectable() const
 589 {
 590         return segment_selectable_;
 591 }
 592
 593 Trace::SegmentDisplayMode View::segment_display_mode() const
 594 {
 595         return segment_display_mode_;
 596 }
 597
 598 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 599 {
 600         trigger_markers_.clear();
 601
 602         segment_display_mode_ = mode;
 603
 604         for (shared_ptr<Signal> signal : signals_)
 605                 signal->set_segment_display_mode(mode);
 606
 607         uint32_t last_segment = session_.get_segment_count() - 1;
 608
 609         switch (mode) {
 610         case Trace::ShowLastSegmentOnly:
 611                 if (current_segment_ != last_segment)
 612                         set_current_segment(last_segment);
 613                 break;
 614
 615         case Trace::ShowLastCompleteSegmentOnly:
 616                 // Do nothing if we only have one segment so far
 617                 if (last_segment > 0) {
 618                         // If the last segment isn't complete, the previous one must be
 619                         uint32_t segment_id =
 620                                 (session_.all_segments_complete(last_segment)) ?
 621                                 last_segment : last_segment - 1;
 622
 623                         if (current_segment_ != segment_id)
 624                                 set_current_segment(segment_id);
 625                 }
 626                 break;
 627
 628         case Trace::ShowSingleSegmentOnly:
 629         case Trace::ShowAllSegments:
 630         case Trace::ShowAccumulatedIntensity:
 631         default:
 632                 // Current segment remains as-is
 633                 break;
 634         }
 635
 636         segment_selectable_ = true;
 637
 638         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 639                 segment_selectable_ = false;
 640
 641         viewport_->update();
 642
 643         segment_display_mode_changed((int)mode, segment_selectable_);
 644 }
 645
 646 void View::zoom(double steps)
 647 {
 648         zoom(steps, viewport_->width() / 2);
 649 }
 650
 651 void View::zoom(double steps, int offset)
 652 {
 653         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 654 }
 655
 656 void View::zoom_fit(bool gui_state)
 657 {
 658         // Act as one-shot when stopped, toggle along with the GUI otherwise
 659         if (session_.get_capture_state() == Session::Stopped) {
 660                 always_zoom_to_fit_ = false;
 661                 always_zoom_to_fit_changed(false);
 662         } else {
 663                 always_zoom_to_fit_ = gui_state;
 664                 always_zoom_to_fit_changed(gui_state);
 665         }
 666
 667         const pair<Timestamp, Timestamp> extents = get_time_extents();
 668         const Timestamp delta = extents.second - extents.first;
 669         if (delta < Timestamp("1e-12"))
 670                 return;
 671
 672         assert(viewport_);
 673         const int w = viewport_->width();
 674         if (w <= 0)
 675                 return;
 676
 677         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 678         set_scale_offset(scale.convert_to<double>(), extents.first);
 679 }
 680
 681 void View::zoom_one_to_one()
 682 {
 683         using pv::data::SignalData;
 684
 685         // Make a set of all the visible data objects
 686         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 687         if (visible_data.empty())
 688                 return;
 689
 690         assert(viewport_);
 691         const int w = viewport_->width();
 692         if (w <= 0)
 693                 return;
 694
 695         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 696 }
 697
 698 void View::set_scale_offset(double scale, const Timestamp& offset)
 699 {
 700         // Disable sticky scrolling / always zoom to fit when acquisition runs
 701         // and user drags the viewport
 702         if ((scale_ == scale) && (offset_ != offset) &&
 703                         (session_.get_capture_state() == Session::Running)) {
 704
 705                 if (sticky_scrolling_) {
 706                         sticky_scrolling_ = false;
 707                         sticky_scrolling_changed(false);
 708                 }
 709
 710                 if (always_zoom_to_fit_) {
 711                         always_zoom_to_fit_ = false;
 712                         always_zoom_to_fit_changed(false);
 713                 }
 714         }
 715
 716         set_scale(scale);
 717         set_offset(offset);
 718
 719         calculate_tick_spacing();
 720
 721         update_scroll();
 722         ruler_->update();
 723         viewport_->update();
 724 }
 725
 726 set< shared_ptr<SignalData> > View::get_visible_data() const
 727 {
 728         // Make a set of all the visible data objects
 729         set< shared_ptr<SignalData> > visible_data;
 730         for (const shared_ptr<Signal> sig : signals_)
 731                 if (sig->enabled())
 732                         visible_data.insert(sig->data());
 733
 734         return visible_data;
 735 }
 736
 737 pair<Timestamp, Timestamp> View::get_time_extents() const
 738 {
 739         boost::optional<Timestamp> left_time, right_time;
 740         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 741         for (const shared_ptr<SignalData> d : visible_data) {
 742                 const vector< shared_ptr<Segment> > segments = d->segments();
 743                 for (const shared_ptr<Segment> &s : segments) {
 744                         double samplerate = s->samplerate();
 745                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 746
 747                         const Timestamp start_time = s->start_time();
 748                         left_time = left_time ?
 749                                 min(*left_time, start_time) :
 750                                                 start_time;
 751                         right_time = right_time ?
 752                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 753                                                  start_time + d->max_sample_count() / samplerate;
 754                 }
 755         }
 756
 757         if (!left_time || !right_time)
 758                 return make_pair(0, 0);
 759
 760         assert(*left_time < *right_time);
 761         return make_pair(*left_time, *right_time);
 762 }
 763
 764 void View::enable_show_sampling_points(bool state)
 765 {
 766         (void)state;
 767
 768         viewport_->update();
 769 }
 770
 771 void View::enable_show_analog_minor_grid(bool state)
 772 {
 773         (void)state;
 774
 775         viewport_->update();
 776 }
 777
 778 void View::enable_coloured_bg(bool state)
 779 {
 780         coloured_bg_ = state;
 781         viewport_->update();
 782 }
 783
 784 bool View::coloured_bg() const
 785 {
 786         return coloured_bg_;
 787 }
 788
 789 bool View::cursors_shown() const
 790 {
 791         return show_cursors_;
 792 }
 793
 794 void View::show_cursors(bool show)
 795 {
 796         show_cursors_ = show;
 797         ruler_->update();
 798         viewport_->update();
 799 }
 800
 801 void View::centre_cursors()
 802 {
 803         const double time_width = scale_ * viewport_->width();
 804         cursors_->first()->set_time(offset_ + time_width * 0.4);
 805         cursors_->second()->set_time(offset_ + time_width * 0.6);
 806         ruler_->update();
 807         viewport_->update();
 808 }
 809
 810 shared_ptr<CursorPair> View::cursors() const
 811 {
 812         return cursors_;
 813 }
 814
 815 void View::add_flag(const Timestamp& time)
 816 {
 817         flags_.push_back(make_shared<Flag>(*this, time,
 818                 QString("%1").arg(next_flag_text_)));
 819
 820         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 821                 (next_flag_text_ + 1);
 822
 823         time_item_appearance_changed(true, true);
 824 }
 825
 826 void View::remove_flag(shared_ptr<Flag> flag)
 827 {
 828         flags_.remove(flag);
 829         time_item_appearance_changed(true, true);
 830 }
 831
 832 vector< shared_ptr<Flag> > View::flags() const
 833 {
 834         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 835         stable_sort(flags.begin(), flags.end(),
 836                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 837                         return a->time() < b->time();
 838                 });
 839
 840         return flags;
 841 }
 842
 843 const QPoint& View::hover_point() const
 844 {
 845         return hover_point_;
 846 }
 847
 848 void View::restack_all_trace_tree_items()
 849 {
 850         // Make a list of owners that is sorted from deepest first
 851         const vector<shared_ptr<TraceTreeItem>> items(
 852                 list_by_type<TraceTreeItem>());
 853         set< TraceTreeItemOwner* > owners;
 854         for (const auto &r : items)
 855                 owners.insert(r->owner());
 856         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 857         sort(sorted_owners.begin(), sorted_owners.end(),
 858                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 859                         return a->depth() > b->depth(); });
 860
 861         // Restack the items recursively
 862         for (auto &o : sorted_owners)
 863                 o->restack_items();
 864
 865         // Animate the items to their destination
 866         for (const auto &i : items)
 867                 i->animate_to_layout_v_offset();
 868 }
 869
 870 void View::on_setting_changed(const QString &key, const QVariant &value)
 871 {
 872         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
 873                 on_settingViewTriggerIsZeroTime_changed(value);
 874 }
 875
 876 void View::trigger_event(int segment_id, util::Timestamp location)
 877 {
 878         // TODO This doesn't work if we're showing multiple segments at once
 879         if ((uint32_t)segment_id != current_segment_)
 880                 return;
 881
 882         // Set zero location if the Key_View_TriggerIsZeroTime setting is set and
 883         // if this is the first trigger for this segment.
 884         GlobalSettings settings;
 885         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 886
 887         size_t trigger_count = session_.get_triggers(current_segment_).size();
 888
 889         if (trigger_is_zero_time && trigger_count == 1)
 890                 set_zero_position(location);
 891
 892         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 893 }
 894
 895 void View::get_scroll_layout(double &length, Timestamp &offset) const
 896 {
 897         const pair<Timestamp, Timestamp> extents = get_time_extents();
 898         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 899         offset = offset_ / scale_;
 900 }
 901
 902 void View::set_zoom(double scale, int offset)
 903 {
 904         // Reset the "always zoom to fit" feature as the user changed the zoom
 905         always_zoom_to_fit_ = false;
 906         always_zoom_to_fit_changed(false);
 907
 908         const Timestamp cursor_offset = offset_ + scale_ * offset;
 909         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 910         const Timestamp new_offset = cursor_offset - new_scale * offset;
 911         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 912 }
 913
 914 void View::calculate_tick_spacing()
 915 {
 916         const double SpacingIncrement = 10.0f;
 917         const double MinValueSpacing = 40.0f;
 918
 919         // Figure out the highest numeric value visible on a label
 920         const QSize areaSize = viewport_->size();
 921         const Timestamp max_time = max(fabs(offset_),
 922                 fabs(offset_ + scale_ * areaSize.width()));
 923
 924         double min_width = SpacingIncrement;
 925         double label_width, tick_period_width;
 926
 927         QFontMetrics m(QApplication::font());
 928
 929         // Copies of the member variables with the same name, used in the calculation
 930         // and written back afterwards, so that we don't emit signals all the time
 931         // during the calculation.
 932         pv::util::Timestamp tick_period = tick_period_;
 933         pv::util::SIPrefix tick_prefix = tick_prefix_;
 934         unsigned tick_precision = tick_precision_;
 935
 936         do {
 937                 const double min_period = scale_ * min_width;
 938
 939                 const int order = (int)floorf(log10f(min_period));
 940                 const pv::util::Timestamp order_decimal =
 941                         pow(pv::util::Timestamp(10), order);
 942
 943                 // Allow for a margin of error so that a scale unit of 1 can be used.
 944                 // Otherwise, for a SU of 1 the tick period will almost always be below
 945                 // the min_period by a small amount - and thus skipped in favor of 2.
 946                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 947                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 948                 double tp_with_margin;
 949                 unsigned int unit = 0;
 950
 951                 do {
 952                         tp_with_margin = order_decimal.convert_to<double>() *
 953                                 (ScaleUnits[unit++] + tp_margin);
 954                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 955
 956                 minor_tick_count_ = (unit == 2) ? (4) : (5);
 957                 tick_period = order_decimal * ScaleUnits[unit - 1];
 958                 tick_prefix = static_cast<pv::util::SIPrefix>(
 959                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 960
 961                 // Precision is the number of fractional digits required, not
 962                 // taking the prefix into account (and it must never be negative)
 963                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 964
 965                 tick_period_width = (tick_period / scale_).convert_to<double>();
 966
 967                 const QString label_text = Ruler::format_time_with_distance(
 968                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 969
 970                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 971                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 972                                 MinValueSpacing;
 973
 974                 min_width += SpacingIncrement;
 975         } while (tick_period_width < label_width);
 976
 977         set_tick_period(tick_period);
 978         set_tick_prefix(tick_prefix);
 979         set_tick_precision(tick_precision);
 980 }
 981
 982 void View::adjust_top_margin()
 983 {
 984         assert(viewport_);
 985
 986         const QSize areaSize = viewport_->size();
 987
 988         const pair<int, int> extents = v_extents();
 989         const int top_margin = owner_visual_v_offset() + extents.first;
 990         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 991
 992         // Do we have empty space at the top while the last trace goes out of screen?
 993         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
 994                 const int trace_height = extents.second - extents.first;
 995
 996                 // Center everything vertically if there is enough space
 997                 if (areaSize.height() >= trace_height)
 998                         set_v_offset(extents.first -
 999                                 ((areaSize.height() - trace_height) / 2));
1000                 else
1001                         // Remove the top margin to make as many traces fit on screen as possible
1002                         set_v_offset(extents.first);
1003         }
1004 }
1005
1006 void View::update_scroll()
1007 {
1008         assert(viewport_);
1009         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1010         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1011
1012         const QSize areaSize = viewport_->size();
1013
1014         // Set the horizontal scroll bar
1015         double length = 0;
1016         Timestamp offset;
1017         get_scroll_layout(length, offset);
1018         length = max(length - areaSize.width(), 0.0);
1019
1020         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1021
1022         hscrollbar->setPageStep(areaSize.width() / 2);
1023         hscrollbar->setSingleStep(major_tick_distance);
1024
1025         updating_scroll_ = true;
1026
1027         if (length < MaxScrollValue) {
1028                 hscrollbar->setRange(0, length);
1029                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1030         } else {
1031                 hscrollbar->setRange(0, MaxScrollValue);
1032                 hscrollbar->setSliderPosition(
1033                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1034         }
1035
1036         updating_scroll_ = false;
1037
1038         // Set the vertical scrollbar
1039         vscrollbar->setPageStep(areaSize.height());
1040         vscrollbar->setSingleStep(areaSize.height() / 8);
1041
1042         const pair<int, int> extents = v_extents();
1043
1044         // Don't change the scrollbar range if there are no traces
1045         if (extents.first != extents.second)
1046                 vscrollbar->setRange(extents.first - areaSize.height(),
1047                         extents.second);
1048
1049         if (scroll_needs_defaults_)
1050                 set_scroll_default();
1051 }
1052
1053 void View::reset_scroll()
1054 {
1055         scrollarea_->verticalScrollBar()->setRange(0, 0);
1056 }
1057
1058 void View::set_scroll_default()
1059 {
1060         assert(viewport_);
1061
1062         const QSize areaSize = viewport_->size();
1063
1064         const pair<int, int> extents = v_extents();
1065         const int trace_height = extents.second - extents.first;
1066
1067         // Do all traces fit in the view?
1068         if (areaSize.height() >= trace_height)
1069                 // Center all traces vertically
1070                 set_v_offset(extents.first -
1071                         ((areaSize.height() - trace_height) / 2));
1072         else
1073                 // Put the first trace at the top, letting the bottom ones overflow
1074                 set_v_offset(extents.first);
1075 }
1076
1077 void View::determine_if_header_was_shrunk()
1078 {
1079         const int header_pane_width = splitter_->sizes().front();
1080         const int header_width = header_->extended_size_hint().width();
1081
1082         // Allow for a slight margin of error so that we also accept
1083         // slight differences when e.g. a label name change increased
1084         // the overall width
1085         header_was_shrunk_ = (header_pane_width < (header_width - 10));
1086 }
1087
1088 void View::resize_header_to_fit()
1089 {
1090         // Setting the maximum width of the header widget doesn't work as
1091         // expected because the splitter would allow the user to make the
1092         // pane wider than that, creating empty space as a result.
1093         // To make this work, we stricly enforce the maximum width by
1094         // expanding the header unless the user shrunk it on purpose.
1095         // As we're then setting the width of the header pane, we set the
1096         // splitter to the maximum allowed position.
1097
1098         int splitter_area_width = 0;
1099         for (int w : splitter_->sizes())
1100                 splitter_area_width += w;
1101
1102         // Make sure the header has enough horizontal space to show all labels fully
1103         QList<int> pane_sizes;
1104         pane_sizes.push_back(header_->extended_size_hint().width());
1105         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1106         splitter_->setSizes(pane_sizes);
1107 }
1108
1109 void View::update_layout()
1110 {
1111         update_scroll();
1112 }
1113
1114 TraceTreeItemOwner* View::find_prevalent_trace_group(
1115         const shared_ptr<sigrok::ChannelGroup> &group,
1116         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1117                 &signal_map)
1118 {
1119         assert(group);
1120
1121         unordered_set<TraceTreeItemOwner*> owners;
1122         vector<TraceTreeItemOwner*> owner_list;
1123
1124         // Make a set and a list of all the owners
1125         for (const auto &channel : group->channels()) {
1126                 for (auto entry : signal_map) {
1127                         if (entry.first->channel() == channel) {
1128                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1129                                 owner_list.push_back(o);
1130                                 owners.insert(o);
1131                         }
1132                 }
1133         }
1134
1135         // Iterate through the list of owners, and find the most prevalent
1136         size_t max_prevalence = 0;
1137         TraceTreeItemOwner *prevalent_owner = nullptr;
1138         for (TraceTreeItemOwner *owner : owners) {
1139                 const size_t prevalence = count_if(
1140                         owner_list.begin(), owner_list.end(),
1141                         [&](TraceTreeItemOwner *o) { return o == owner; });
1142                 if (prevalence > max_prevalence) {
1143                         max_prevalence = prevalence;
1144                         prevalent_owner = owner;
1145                 }
1146         }
1147
1148         return prevalent_owner;
1149 }
1150
1151 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1152         const vector< shared_ptr<sigrok::Channel> > &channels,
1153         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1154                 &signal_map,
1155         set< shared_ptr<Trace> > &add_list)
1156 {
1157         vector< shared_ptr<Trace> > filtered_traces;
1158
1159         for (const auto &channel : channels) {
1160                 for (auto entry : signal_map) {
1161                         if (entry.first->channel() == channel) {
1162                                 shared_ptr<Trace> trace = entry.second;
1163                                 const auto list_iter = add_list.find(trace);
1164                                 if (list_iter == add_list.end())
1165                                         continue;
1166
1167                                 filtered_traces.push_back(trace);
1168                                 add_list.erase(list_iter);
1169                         }
1170                 }
1171         }
1172
1173         return filtered_traces;
1174 }
1175
1176 void View::determine_time_unit()
1177 {
1178         // Check whether we know the sample rate and hence can use time as the unit
1179         if (time_unit_ == util::TimeUnit::Samples) {
1180                 // Check all signals but...
1181                 for (const shared_ptr<Signal> signal : signals_) {
1182                         const shared_ptr<SignalData> data = signal->data();
1183
1184                         // ...only check first segment of each
1185                         const vector< shared_ptr<Segment> > segments = data->segments();
1186                         if (!segments.empty())
1187                                 if (segments[0]->samplerate()) {
1188                                         set_time_unit(util::TimeUnit::Time);
1189                                         break;
1190                                 }
1191                 }
1192         }
1193 }
1194
1195 bool View::eventFilter(QObject *object, QEvent *event)
1196 {
1197         const QEvent::Type type = event->type();
1198         if (type == QEvent::MouseMove) {
1199
1200                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1201                 if (object == viewport_)
1202                         hover_point_ = mouse_event->pos();
1203                 else if (object == ruler_)
1204                         hover_point_ = QPoint(mouse_event->x(), 0);
1205                 else if (object == header_)
1206                         hover_point_ = QPoint(0, mouse_event->y());
1207                 else
1208                         hover_point_ = QPoint(-1, -1);
1209
1210                 update_hover_point();
1211
1212         } else if (type == QEvent::Leave) {
1213                 hover_point_ = QPoint(-1, -1);
1214                 update_hover_point();
1215         } else if (type == QEvent::Show) {
1216
1217                 // This is somewhat of a hack, unfortunately. We cannot use
1218                 // set_v_offset() from within restore_settings() as the view
1219                 // at that point is neither visible nor properly sized.
1220                 // This is the least intrusive workaround I could come up
1221                 // with: set the vertical offset (or scroll defaults) when
1222                 // the view is shown, which happens after all widgets were
1223                 // resized to their final sizes.
1224                 update_layout();
1225
1226                 if (settings_restored_)
1227                         determine_if_header_was_shrunk();
1228                 else
1229                         resize_header_to_fit();
1230
1231                 if (scroll_needs_defaults_) {
1232                         set_scroll_default();
1233                         scroll_needs_defaults_ = false;
1234                 }
1235
1236                 if (saved_v_offset_) {
1237                         set_v_offset(saved_v_offset_);
1238                         saved_v_offset_ = 0;
1239                 }
1240         }
1241
1242         return QObject::eventFilter(object, event);
1243 }
1244
1245 void View::resizeEvent(QResizeEvent* event)
1246 {
1247         // Only adjust the top margin if we shrunk vertically
1248         if (event->size().height() < event->oldSize().height())
1249                 adjust_top_margin();
1250
1251         update_layout();
1252 }
1253
1254 void View::update_hover_point()
1255 {
1256         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1257                 list_by_type<TraceTreeItem>());
1258         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1259                 r->hover_point_changed(hover_point_);
1260
1261         hover_point_changed(hover_point_);
1262 }
1263
1264 void View::row_item_appearance_changed(bool label, bool content)
1265 {
1266         if (label)
1267                 header_->update();
1268         if (content)
1269                 viewport_->update();
1270 }
1271
1272 void View::time_item_appearance_changed(bool label, bool content)
1273 {
1274         if (label) {
1275                 ruler_->update();
1276
1277                 // Make sure the header pane width is updated, too
1278                 update_layout();
1279         }
1280
1281         if (content)
1282                 viewport_->update();
1283 }
1284
1285 void View::extents_changed(bool horz, bool vert)
1286 {
1287         sticky_events_ |=
1288                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1289                 (vert ? TraceTreeItemVExtentsChanged : 0);
1290
1291         lazy_event_handler_.start();
1292 }
1293
1294 void View::on_signal_name_changed()
1295 {
1296         if (!header_was_shrunk_)
1297                 resize_header_to_fit();
1298 }
1299
1300 void View::on_splitter_moved()
1301 {
1302         // The header can only shrink when the splitter is moved manually
1303         determine_if_header_was_shrunk();
1304
1305         if (!header_was_shrunk_)
1306                 resize_header_to_fit();
1307 }
1308
1309 void View::h_scroll_value_changed(int value)
1310 {
1311         if (updating_scroll_)
1312                 return;
1313
1314         // Disable sticky scrolling when user moves the horizontal scroll bar
1315         // during a running acquisition
1316         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1317                 sticky_scrolling_ = false;
1318                 sticky_scrolling_changed(false);
1319         }
1320
1321         const int range = scrollarea_->horizontalScrollBar()->maximum();
1322         if (range < MaxScrollValue)
1323                 set_offset(scale_ * value);
1324         else {
1325                 double length = 0;
1326                 Timestamp offset;
1327                 get_scroll_layout(length, offset);
1328                 set_offset(scale_ * length * value / MaxScrollValue);
1329         }
1330
1331         ruler_->update();
1332         viewport_->update();
1333 }
1334
1335 void View::v_scroll_value_changed()
1336 {
1337         header_->update();
1338         viewport_->update();
1339 }
1340
1341 void View::signals_changed()
1342 {
1343         using sigrok::Channel;
1344
1345         vector< shared_ptr<Channel> > channels;
1346         shared_ptr<sigrok::Device> sr_dev;
1347         bool signals_added_or_removed = false;
1348
1349         // Do we need to set the vertical scrollbar to its default position later?
1350         // We do if there are no traces, i.e. the scroll bar has no range set
1351         bool reset_scrollbar =
1352                 (scrollarea_->verticalScrollBar()->minimum() ==
1353                         scrollarea_->verticalScrollBar()->maximum());
1354
1355         if (!session_.device()) {
1356                 reset_scroll();
1357                 signals_.clear();
1358         } else {
1359                 sr_dev = session_.device()->device();
1360                 assert(sr_dev);
1361                 channels = sr_dev->channels();
1362         }
1363
1364         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1365
1366         // Make a list of traces that are being added, and a list of traces
1367         // that are being removed
1368         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1369         const set<shared_ptr<Trace>> prev_traces(
1370                 prev_trace_list.begin(), prev_trace_list.end());
1371
1372         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1373
1374 #ifdef ENABLE_DECODE
1375         traces.insert(decode_traces_.begin(), decode_traces_.end());
1376 #endif
1377
1378         set< shared_ptr<Trace> > add_traces;
1379         set_difference(traces.begin(), traces.end(),
1380                 prev_traces.begin(), prev_traces.end(),
1381                 inserter(add_traces, add_traces.begin()));
1382
1383         set< shared_ptr<Trace> > remove_traces;
1384         set_difference(prev_traces.begin(), prev_traces.end(),
1385                 traces.begin(), traces.end(),
1386                 inserter(remove_traces, remove_traces.begin()));
1387
1388         // Make a look-up table of sigrok Channels to pulseview Signals
1389         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1390                 signal_map;
1391         for (const shared_ptr<Signal> &sig : signals_)
1392                 signal_map[sig->base()] = sig;
1393
1394         // Populate channel groups
1395         if (sr_dev)
1396                 for (auto entry : sr_dev->channel_groups()) {
1397                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1398
1399                         if (group->channels().size() <= 1)
1400                                 continue;
1401
1402                         // Find best trace group to add to
1403                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1404                                 group, signal_map);
1405
1406                         // If there is no trace group, create one
1407                         shared_ptr<TraceGroup> new_trace_group;
1408                         if (!owner) {
1409                                 new_trace_group.reset(new TraceGroup());
1410                                 owner = new_trace_group.get();
1411                         }
1412
1413                         // Extract traces for the trace group, removing them from
1414                         // the add list
1415                         const vector< shared_ptr<Trace> > new_traces_in_group =
1416                                 extract_new_traces_for_channels(group->channels(),
1417                                         signal_map, add_traces);
1418
1419                         // Add the traces to the group
1420                         const pair<int, int> prev_v_extents = owner->v_extents();
1421                         int offset = prev_v_extents.second - prev_v_extents.first;
1422                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1423                                 assert(trace);
1424                                 owner->add_child_item(trace);
1425
1426                                 const pair<int, int> extents = trace->v_extents();
1427                                 if (trace->enabled())
1428                                         offset += -extents.first;
1429                                 trace->force_to_v_offset(offset);
1430                                 if (trace->enabled())
1431                                         offset += extents.second;
1432                         }
1433
1434                         if (new_trace_group) {
1435                                 // Assign proper vertical offsets to each channel in the group
1436                                 new_trace_group->restack_items();
1437
1438                                 // If this is a new group, enqueue it in the new top level
1439                                 // items list
1440                                 if (!new_traces_in_group.empty())
1441                                         new_top_level_items.push_back(new_trace_group);
1442                         }
1443                 }
1444
1445         // Enqueue the remaining logic channels in a group
1446         vector< shared_ptr<Channel> > logic_channels;
1447         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1448                 [](const shared_ptr<Channel>& c) {
1449                         return c->type() == sigrok::ChannelType::LOGIC; });
1450
1451         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1452                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1453
1454         if (non_grouped_logic_signals.size() > 0) {
1455                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1456                         make_shared<TraceGroup>());
1457                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1458                         non_grouped_trace_group->add_child_item(trace);
1459
1460                 non_grouped_trace_group->restack_items();
1461                 new_top_level_items.push_back(non_grouped_trace_group);
1462         }
1463
1464         // Enqueue the remaining channels as free ungrouped traces
1465         const vector< shared_ptr<Trace> > new_top_level_signals =
1466                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1467         new_top_level_items.insert(new_top_level_items.end(),
1468                 new_top_level_signals.begin(), new_top_level_signals.end());
1469
1470         // Enqueue any remaining traces i.e. decode traces
1471         new_top_level_items.insert(new_top_level_items.end(),
1472                 add_traces.begin(), add_traces.end());
1473
1474         // Remove any removed traces
1475         for (shared_ptr<Trace> trace : remove_traces) {
1476                 TraceTreeItemOwner *const owner = trace->owner();
1477                 assert(owner);
1478                 owner->remove_child_item(trace);
1479                 signals_added_or_removed = true;
1480         }
1481
1482         // Remove any empty trace groups
1483         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1484                 if (group->child_items().size() == 0) {
1485                         remove_child_item(group);
1486                         group.reset();
1487                 }
1488
1489         // Add and position the pending top levels items
1490         int offset = v_extents().second;
1491         for (auto item : new_top_level_items) {
1492                 add_child_item(item);
1493
1494                 // Position the item after the last item or at the top if there is none
1495                 const pair<int, int> extents = item->v_extents();
1496
1497                 if (item->enabled())
1498                         offset += -extents.first;
1499
1500                 item->force_to_v_offset(offset);
1501
1502                 if (item->enabled())
1503                         offset += extents.second;
1504                 signals_added_or_removed = true;
1505         }
1506
1507
1508         if (signals_added_or_removed && !header_was_shrunk_)
1509                 resize_header_to_fit();
1510
1511         update_layout();
1512
1513         header_->update();
1514         viewport_->update();
1515
1516         if (reset_scrollbar)
1517                 set_scroll_default();
1518 }
1519
1520 void View::capture_state_updated(int state)
1521 {
1522         GlobalSettings settings;
1523
1524         if (state == Session::Running) {
1525                 set_time_unit(util::TimeUnit::Samples);
1526
1527                 trigger_markers_.clear();
1528
1529                 scale_at_acq_start_ = scale_;
1530                 offset_at_acq_start_ = offset_;
1531
1532                 // Activate "always zoom to fit" if the setting is enabled and we're
1533                 // the main view of this session (other trace views may be used for
1534                 // zooming and we don't want to mess them up)
1535                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1536                 if (is_main_view_ && state) {
1537                         always_zoom_to_fit_ = true;
1538                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1539                 }
1540
1541                 // Enable sticky scrolling if the setting is enabled
1542                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1543
1544                 // Reset all traces to segment 0
1545                 current_segment_ = 0;
1546                 set_current_segment(current_segment_);
1547         }
1548
1549         if (state == Session::Stopped) {
1550                 // After acquisition has stopped we need to re-calculate the ticks once
1551                 // as it's otherwise done when the user pans or zooms, which is too late
1552                 calculate_tick_spacing();
1553
1554                 // Reset "always zoom to fit", the acquisition has stopped
1555                 if (always_zoom_to_fit_) {
1556                         // Perform a final zoom-to-fit before disabling
1557                         zoom_fit(always_zoom_to_fit_);
1558                         always_zoom_to_fit_ = false;
1559                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1560                 }
1561
1562                 bool zoom_to_fit_after_acq =
1563                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1564
1565                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1566                 // we didn't restore settings in the meanwhile
1567                 if (zoom_to_fit_after_acq &&
1568                         !suppress_zoom_to_fit_after_acq_ &&
1569                         (scale_ == scale_at_acq_start_) &&
1570                         (offset_ == offset_at_acq_start_))
1571                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1572
1573                 suppress_zoom_to_fit_after_acq_ = false;
1574         }
1575 }
1576
1577 void View::on_new_segment(int new_segment_id)
1578 {
1579         on_segment_changed(new_segment_id);
1580 }
1581
1582 void View::on_segment_completed(int segment_id)
1583 {
1584         on_segment_changed(segment_id);
1585 }
1586
1587 void View::on_segment_changed(int segment)
1588 {
1589         switch (segment_display_mode_) {
1590         case Trace::ShowLastSegmentOnly:
1591         case Trace::ShowSingleSegmentOnly:
1592                 set_current_segment(segment);
1593                 break;
1594
1595         case Trace::ShowLastCompleteSegmentOnly:
1596                 // Only update if all segments are complete
1597                 if (session_.all_segments_complete(segment))
1598                         set_current_segment(segment);
1599                 break;
1600
1601         case Trace::ShowAllSegments:
1602         case Trace::ShowAccumulatedIntensity:
1603         default:
1604                 break;
1605         }
1606 }
1607
1608 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
1609 {
1610         if (new_value.toBool()) {
1611                 // The first trigger for this segment is used as the zero position
1612                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
1613                 if (triggers.size() > 0)
1614                         set_zero_position(triggers.front());
1615         } else
1616                 reset_zero_position();
1617 }
1618
1619 void View::perform_delayed_view_update()
1620 {
1621         if (always_zoom_to_fit_) {
1622                 zoom_fit(true);
1623         } else if (sticky_scrolling_) {
1624                 // Make right side of the view sticky
1625                 double length = 0;
1626                 Timestamp offset;
1627                 get_scroll_layout(length, offset);
1628
1629                 const QSize areaSize = viewport_->size();
1630                 length = max(length - areaSize.width(), 0.0);
1631
1632                 set_offset(scale_ * length);
1633         }
1634
1635         determine_time_unit();
1636         update_scroll();
1637         ruler_->update();
1638         viewport_->update();
1639 }
1640
1641 void View::process_sticky_events()
1642 {
1643         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1644                 update_layout();
1645         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1646                 restack_all_trace_tree_items();
1647                 update_scroll();
1648         }
1649
1650         // Clear the sticky events
1651         sticky_events_ = 0;
1652 }
1653
1654 } // namespace trace
1655 } // namespace views
1656 } // namespace pv